singer = ["cali","zengfenghua","liqiang","cali","zhuzhibo","yinxiang","zengfenghua"]
# # print(singer)
# singer = list(set(singer))
# print(singer)
cs_singer = {"cali","zengfh","cali","zengfh","yinxiang","djg","liqiang"}
cs_singer.add("luhang")
cs_singer.update(singer)

print(cs_singer,len(cs_singer))
cs_singer.pop()
print(cs_singer)

cs_singer.discard("luhang")
print(cs_singer)

cs_singer.update({"zhuzhibo3456"})
print(cs_singer)


# singer1 = set(singer)
# print(singer1)
# singer2 = list(singer1)
# print(singer2,singer2[0])
# for i in singer1:
#     print(i)
#




